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OAS - Osservatorio Astronomico Sormano |
| OAS > SAEL - Small Asteroids Encounters List ( Priority List of Asteroids with H > 22.0 or up to 240 mt in diameter) |
|
OAS - Osservatorio Astronomico Sormano |
| OAS > SAEL - Small Asteroids Encounters List ( Priority List of Asteroids with H > 22.0 or up to 240 mt in diameter) |
Last update: May 20, 2025
Computations by: Francesco Manca,..Piero Sicoli,..Augusto Testa (obs.sormano@alice.it).
This list includes small asteroids with an Earth MOID (Minimum Orbital Intersection Distance) lower than 0.015 AU.
Circumstances of the encounters with our planet are closer in time to the epoch of available observations.
Moreover close approaches to the Earth covering a timespan from 7 to 200 years are calculated as a function
of the [U] parameter adopted by the Minor Planet Center, to describe the orbit uncertainty.
(For information about the U parameter see MPC 24597
and the related page).
For all the entries Earth-MOID and close approaches (bold-type for distances <= 0.010 AU) are daily recomputed at each MPC orbit update using a software package developed at Sormano Observatory by A. Testa (unpublished, 1993 and 2016) and internal report N.50 (F. Manca, G. Matarazzo and P. Sicoli, 1996).
A similar list for objects of bigger size (H <= 22.0) is available at MBPL (Minor Body Priority List.).
Close encounters within 3 Lunar Distances are summarized at TECA (Table Earth Close Approaches), including the minimum and maximum miss distances in Km.
For related information:
Close Encounters and Selected Objects lists:
Virtual Impactor:
obs@cfa.harvard.edu.
The following service, courtesy of the Minor Planet
Center, is intended as support and in addition to the objects available in the SAEL list for which follow-up or recovery is needed.
The service will return all objects (NEOs and Comets) based on criteria specified by the user and
NOT filtered in relation to their MOID value.
Astrometric observations of any of the following objects should be sent directly
to obs@cfa.harvard.edu.